Herbert W. Franke made computer art from the 1950s, often referring to himself as “the dinosaur of computer art.” His generative explorations began in the mid-1950s, working with an analog computer, an oscilloscope as output device and a camera to capture the patterns of continuous lines the installation generated.

Certainly Herbert W. Franke was one of the amazing theorists as well, and historians of digital art. I mean, he actually wrote the first history book on early computer art.
Georg Bak, Elevating Generative Art: Casey Reas, ciphrd, Anne Spalter
The work of Herbert W. Franke was very familiar to me because what he did was applying a generative system to produce outputs, which I found interesting.
Hans Dehlinger, The 1970s Artist-Programmer: Truckenbrod, Dehlinger